GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove rear bumper fascia. Refer to [ADD LINK] in Bumpers.

  2. Object Number: 489061  Size: SH
  3. Disconnect the electrical connector from the rear object sensor.

  4. Object Number: 500502  Size: SH
  5. Lift the locking tabs on the housing (4) and remove the rear object sensor (1).

  6. Object Number: 489063  Size: SH
  7. Squeeze the retention spring (1) and remove it from the housing (2).

  8. Object Number: 489064  Size: SH
  9. Release the tabs on the housing and remove.

  10. Object Number: 489066  Size: SH
  11. Remove the bezel by pushing it through the bumper fascia.

Installation Procedure

    Important: Do not refinish previously painted sensors.

  1. Paint the new rear object sensor. Refer to [ADD LINK] in Paints and Coatings.
  2. Check the paint thickness to ensure it does not exceed 6 mils using a paint thickness gauge suitable for non-ferrous metals. Refer to [ADD LINK] in Paints and Coatings.

  3. Object Number: 489066  Size: SH
  4. Install the rear object sensor bezel by pressing the ring inward until it is flush with the fascia.

  5. Object Number: 500505  Size: SH
  6. Align the keyhole (2) with the key (1) and press the sensor bezel into the fascia.

  7. Object Number: 489064  Size: SH
  8. Install the housing to the bezel through the back side of the fascia. The housing snaps into the cutouts on the bezel.
  9. Important: The spring keys must be on the top and bottom of the housing.


    Object Number: 489063  Size: SH
  10. Install the spring (1) to the housing (2).

  11. Object Number: 500502  Size: SH
  12. Install the decoupling ring (2) to the sensor (1).
  13. Insert the sensor into the housing (4) with the connector pointing toward the passenger side of the fascia. The sensor tabs snap into the cutouts on the housing (4).

  14. Object Number: 489061  Size: SH
  15. Connect the electrical connector to the rear object sensor.
  16. Install the rear bumper fascia. Refer to [ADD LINK] in Bumpers.